feat(voice): adapt voice entry to the stacked-jobs prosthesis model

Authored by the /orchestrate builder agent, committed unrepaired so the
fixes that follow are reviewable against it.

Backend: replaces the flat prosthesisDefaultType/prosthesisOverrides wire
shape with a prosthesis: ProsthesisAssignment[] list whose targets can be a
tooth or a jaw; adds resolveAssignmentTarget / classifyTypeCode /
resolveProsthesisAssignment for leaf-vs-category classification, region
validity with mixed-region deferral, and assignmentIndex on unresolved
items; adds PROSTHESIS_CATEGORY and PROSTHESIS_SUBCATEGORY to
CatalogEntityKind with a migration and seeded fa/en/nl translations; and
rewrites the extraction prompt to render the catalog as a tree.

Frontend: merged "teeth and prosthesis" row, stack preview through the
existing applyLeafToJobs, three chip-fold paths, rewritten applyVoiceResult
and voiceForEditor, and the two carried-forward recording fixes — the
container fallback that refused Safari and the render gate that never
checked isMediaRecorderSupported().

Adds Vitest for the frontend's pure helpers, and updates CLAUDE.md.

Gate was green: backend 16 suites / 209 tests, nest build, prisma validate;
frontend 37 Vitest tests, tsc --noEmit, next build.

KNOWN DEFECTS, fixed in the commits that follow:
- VoiceReviewSheet.tsx:169 — a picked tooth chip is dropped on Apply
- VoiceReviewSheet.tsx:213 / TreatmentWorkspace.tsx:2215 — decision 41's
  type-row lock is missing, so unticking it saves prosthesis lab rows on a
  non-prosthesis detail

Reviewed on the correctness lens only; regression-risk never ran. The
migration was validated but never applied.

Spec: docs/specs/voice-treatment-entry/spec.md
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -39,6 +39,7 @@ There is **no root `package.json`**. Every npm command runs inside `backend/` or
 | `npx tsc --noEmit` | **Verification gate for any type or cross-cutting frontend change** |
 | `npm run build` | Production build (`output: 'standalone'`) |
 | `npm run lint` | ESLint via Next |
+| `npx vitest run` | Vitest — pure helpers only (`prosthesisTree.ts`, `voiceReviewRows.ts`) |
 
 `NEXT_PUBLIC_*` values are baked in at build time — restart `npm run dev` after changing `.env.local`.
 
@@ -102,7 +103,7 @@ Clinics may only dispatch to labs they are linked to: `OrganizationLink` (A↔B,
 
 ### Tests
 
-Jest covers pure logic only — permission normalization, phone/timezone helpers, task generation, lab-send validation (7 suites in `backend/src/**`). There are no frontend tests; `npx tsc --noEmit` is the frontend gate.
+Jest covers pure logic only — permission normalization, phone/timezone helpers, task generation, lab-send validation, voice extraction contract (`backend/src/**`). Frontend has Vitest for its own pure helpers only — no React, no DOM: `prosthesisTree.ts` and `voiceReviewRows.ts` (`frontend/src/components/treatment/*.spec.ts`), run via `npx vitest run`. `npx tsc --noEmit` remains the frontend's cross-cutting gate.
 
 ## Deployment